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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 30 // - 30
5/x-30 = 0
5*x^-1 = 30 // : 5
x^-1 = 6
-1 < 0
1/(x^1) = 6 // * x^1
1 = 6*x^1 // : 6
1/6 = x^1
x = 1/6
x = 1/6
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